// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_DEBUG_RENDERING_STATS_INSTRUMENTATION_H_
#define CC_DEBUG_RENDERING_STATS_INSTRUMENTATION_H_

#include <stdint.h>

#include <memory>

#include "base/macros.h"
#include "base/synchronization/lock.h"
#include "cc/debug/rendering_stats.h"

namespace cc {

// RenderingStatsInstrumentation is shared among threads and manages conditional
// recording of rendering stats into a private RenderingStats instance.
class CC_EXPORT RenderingStatsInstrumentation {
public:
    static std::unique_ptr<RenderingStatsInstrumentation> Create();
    virtual ~RenderingStatsInstrumentation();

    // Return copy of current impl thread rendering stats.
    RenderingStats impl_thread_rendering_stats();

    // Return the accumulated, combined rendering stats.
    RenderingStats GetRenderingStats();

    // Add current impl thread rendering stats to accumulator and
    // clear current stats.
    void AccumulateAndClearImplThreadStats();

    // Read and write access to the record_rendering_stats_ flag is not locked to
    // improve performance. The flag is commonly turned off and hardly changes
    // it's value during runtime.
    bool record_rendering_stats() const { return record_rendering_stats_; }
    void set_record_rendering_stats(bool record_rendering_stats)
    {
        if (record_rendering_stats_ != record_rendering_stats)
            record_rendering_stats_ = record_rendering_stats;
    }

    void IncrementFrameCount(int64_t count);
    void AddVisibleContentArea(int64_t area);
    void AddApproximatedVisibleContentArea(int64_t area);
    void AddCheckerboardedVisibleContentArea(int64_t area);
    void AddCheckerboardedNoRecordingContentArea(int64_t area);
    void AddCheckerboardedNeedsRasterContentArea(int64_t area);
    void AddDrawDuration(base::TimeDelta draw_duration,
        base::TimeDelta draw_duration_estimate);
    void AddBeginMainFrameToCommitDuration(
        base::TimeDelta begin_main_frame_to_commit_duration);
    void AddCommitToActivateDuration(
        base::TimeDelta commit_to_activate_duration,
        base::TimeDelta commit_to_activate_duration_estimate);

protected:
    RenderingStatsInstrumentation();

private:
    RenderingStats impl_thread_rendering_stats_;
    RenderingStats impl_thread_rendering_stats_accu_;

    bool record_rendering_stats_;

    base::Lock lock_;

    DISALLOW_COPY_AND_ASSIGN(RenderingStatsInstrumentation);
};

} // namespace cc

#endif // CC_DEBUG_RENDERING_STATS_INSTRUMENTATION_H_
